20000012031221 has 4 divisors (see below), whose sum is σ = 20000083158432. Its totient is φ = 19999940904012.

The previous prime is 20000012031217. The next prime is 20000012031239. The reversal of 20000012031221 is 12213021000002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20000012031221 - 2² = 20000012031217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20000012031196 and 20000012031205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000012031721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35140145 + ... + 35704758.

It is an arithmetic number, because the mean of its divisors is an integer number (5000020789608).

Almost surely, 2^{20000012031221} is an apocalyptic number.

It is an amenable number.

20000012031221 is a deficient number, since it is larger than the sum of its proper divisors (71127211).

20000012031221 is an equidigital number, since it uses as much as digits as its factorization.

20000012031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71127210.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20000012031221 its reverse (12213021000002), we get a palindrome (32213033031223).

The spelling of 20000012031221 in words is "twenty trillion, twelve million, thirty-one thousand, two hundred twenty-one".